21124662 has 48 divisors (see below), whose sum is σ = 46484928. Its totient is φ = 6396000.

The previous prime is 21124661. The next prime is 21124681. The reversal of 21124662 is 26642112.

It is a super-2 number, since 2×21124662² = 892502689228488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84037 + ... + 84287.

It is an arithmetic number, because the mean of its divisors is an integer number (968436).

Almost surely, 2^21124662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23242464).

21124662 is an abundant number, since it is smaller than the sum of its proper divisors (25360266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124662 is a wasteful number, since it uses less digits than its factorization.

21124662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 352 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21124662 is about 4596.1573080129. The cubic root of 21124662 is about 276.4372663361.

Adding to 21124662 its reverse (26642112), we get a palindrome (47766774).

The spelling of 21124662 in words is "twenty-one million, one hundred twenty-four thousand, six hundred sixty-two".